THE share market is expected to open marginally weaker today in the absence of a strong US lead. AMP Capital Investors head of investment strategy and chief economist Shane Oliver said on Friday night futures trading pointed to a 12 point, or 0.3 per cent, fall on the benchmark S&P/ASX200 index at open on Monday. While a modest rise on European and US markets on Friday was driven by gains in financial stocks and commodity stocks due to a high oil price, there was "not a lot of action on Wall Street", Mr Oliver said. "Housing data out of the US was on the soft side, with home sales down, so it's a fairly weak lead in for our market," he said.